Is there any leakage from your breasts? This is called colostrum, or "premilk." You can place nursing pads in your bra to absorb this fluid. Even if you don't see anything, your breasts are making colostrum, and you also may find that your bra is fitting a little more snugly than usual. You might want to get a nursing bra, but be sure to get one a size larger than you need now. Trust me; you'll be thankful for the room later.